**Exhibit 21.1**

 

**SUBSIDIARIES OF NEXEN AS AT JANUARY 31, 2009**

 

**1219391Alberta Ltd.**

Incorporated pursuant to the laws of Alberta

 

**CanadianNexen Petroleum East Al Hajr Ltd.**

Incorporatedpursuant to the laws of Alberta

 

**CanadianNexen Petroleum Yemen**

A partnershipdoing business in Yemen

 

**CanadianPetroleum Vietnam Ltd.**

Incorporatedpursuant to the laws of Barbados

 

**CanadianPetroleum Yemen Limited**

Incorporatedpursuant to the laws of Jersey

 

**CanadianOxyOffshore Production Co.**

Incorporatedpursuant to the laws of Delaware

 

**CanexusLimited Partnership**

A partnershipformed pursuant to the laws of Alberta

 

**ICHCapital Management Hungary Limited Liability Company**

Incorporatedpursuant to the laws of Hungary

 

**ICMAssurance Ltd.**

Incorporatedpursuant to the laws of Barbados

 

**ICMCapital Limited**

Incorporated pursuant to the laws of Barbados

 

**InternationalCapital Holdings Limited**

Incorporatedpursuant to the laws of Malta

 

**LongLake Finance Management Ltd.**

Incorporatedpursuant to the laws of Alberta

 

**LongLake Synthetic Crude Management Company Ltd.**

Incorporatedpursuant to the laws of Alberta

 

**NexenChemicals Holdings U.S.A. Inc.**

Incorporatedpursuant to the laws of Delaware

 

**NexenChemicals U.S.A.**

A partnershipformed pursuant to the laws of Delaware

 

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**NexenChemicals U.S.A. Inc.**

Incorporatedpursuant to the laws of Delaware

 

**NexenCrossfield Partnership**

A partnershipformed pursuant to the laws of Alberta

 

**NexenE & P Services Nigeria Limited**

Incorporatedpursuant to the laws of Nigeria

 

**NexenEnergy Holdings International Limited**

Incorporatedpursuant to the laws of Jersey

 

**NexenEnergy Marketing Europe Limited**

Incorporatedpursuant to the laws of the United Kingdom

 

**NexenEnergy Marketing London Limited**

Incorporatedpursuant to the laws of the United Kingdom

 

**NexenEnergy Marketing Middle East Limited**

Incorporated pursuant the laws of Dubai

 

**NexenEnergy Marketing Nigeria Limited**

Incorporated pursuant to the laws of Nigeria

 

**NexenEnergy Services International Ltd.**

Incorporatedpursuant to the laws of the United Kingdom

 

**NexenEttrick U.K. Limited**

Incorporatedpursuant to the laws of the United Kingdom

 

**NexenExploration Norge AS**

Incorporatedpursuant to the laws of Norway

 

**NexenExploration U.K. Limited**

Incorporatedpursuant to the laws of the United Kingdom

 

**NexenField Services Nigeria Limited**

Incorporatedpursuant to the laws of Nigeria

 

**NexenHoldings U.S.A. Inc.**

Incorporatedpursuant to the laws of Delaware

 

**NexenHoldings West Africa Limited**

Incorporatedpursuant to the laws of Jersey

 

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**NexenMarketing**

A partnershipformed pursuant to the laws of Alberta

 

**NexenMarketing International Ltd.**

Incorporatedpursuant to the laws of Barbados

 

**NexenMarketing Singapore Pte Ltd.**

Incorporatedpursuant to the laws of Singapore

 

**NexenMarketing U.S.A. Inc.**

Incorporated pursuantto the laws of Delaware

 

**NexenMed Hat-Hatton Partnership**

A partnershipformed pursuant to the laws of Alberta

 

**Nexen No. 6Ltd.**

Incorporatedpursuant to the laws of Alberta

 

**Nexenof California, Inc.**

Incorporatedpursuant to the laws of Delaware

 

**NexenOil & Gas U.K. Developments LP**

A partnership formed pursuant to the laws of the United Kingdom

 

**NexenOil and Gas U.S.A. Inc.**

Incorporatedpursuant to the laws of Wyoming

 

**Nexen OilSands Partnership**

A partnershipformed pursuant to the laws of Alberta

 

**NexenOilfield Services Nigeria Ltd.**

Incorporatedpursuant to the laws of Barbados

 

**NexenPetroleum Australia Pty Limited**

Incorporatedpursuant to the laws of Australia

 

**NexenPetroleum Capital Management U.S.A. Inc.**

Incorporatedpursuant to the laws of Delaware

 

**NexenPetroleum Colombia Limited**

Incorporatedpursuant to the laws of Jersey

 

**NexenPetroleum Deepwater Nigeria Limited**

Incorporatedpursuant to the laws of Nigeria

 

**NexenPetroleum Equatorial Guinea Limited**

Incorporatedpursuant to the laws of Jersey

 

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**NexenPetroleum Exploration and Production Nigeria Limited**

Incorporatedpursuant to the laws of Nigeria

 

**NexenPetroleum Holdings Australia Pty Limited**

Incorporatedpursuant to the laws of Australia

 

**NexenPetroleum Holdings U.S.A. Inc.**

Incorporatedpursuant to the laws of Delaware

 

**NexenPetroleum International (U.S.A.) Inc.**

Incorporatedpursuant to the laws of Delaware

 

**NexenPetroleum International Co.**

Amalgamatedpursuant to the laws of Nova Scotia

 

**NexenPetroleum Libya Ltd.**

Incorporatedpursuant to the laws of Alberta

 

**NexenPetroleum Madagascar Limited**

Incorporatedpursuant to the laws of Jersey

 

**NexenPetroleum Nigeria Limited**

Incorporatedpursuant to the laws of Nigeria

 

**NexenPetroleum Nigeria Offshore Ltd.**

Incorporatedpursuant to the laws of Alberta

 

**NexenPetroleum North Africa Limited**

Incorporatedpursuant to the laws of Jersey

 

**NexenPetroleum Offshore Equatorial Guinea Ltd.**

Incorporatedpursuant to the laws of Alberta

 

**NexenPetroleum Offshore U.S.A. Inc.**

Incorporatedpursuant to the laws of Delaware

 

**NexenPetroleum Operations Yemen Limited**

Continuedpursuant to the laws of Jersey

 

**NexenPetroleum Sales U.S.A. Inc.**

Incorporatedpursuant to the laws of Texas

 

**NexenPetroleum U.K. Holdings Limited**

Incorporatedpursuant to the laws of the United Kingdom

 

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**NexenPetroleum U.K. Limited**

Incorporatedpursuant to the laws of the United Kingdom

 

**NexenPetroleum U.S.A. Inc.**

Incorporatedpursuant to the laws of Delaware

 

**NexenServices Jersey Limited**

Incorporatedpursuant to the laws of Jersey

 

**QuadraEnergy 2006 Ltd.**

Incorporatedpursuant to the laws of Alberta

 

**QuadraEnergy Trading Ltd.**

Incorporatedpursuant to the laws of Alberta

 

**WascanaEnergy 2001 Ltd.**

Incorporatedpursuant to the laws of Saskatchewan

 

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